Because links on the open web die quickly due to DMCA takedowns by Turn 10 Studios, I cannot link directly to a file host. However, I can tell you exactly where to find the current active links as of this writing.
Where to find a verified Steam 100% Save: forza horizon 4 100 save game steam link
Currently known working filename: Steam_100_Complete_No_Ban.zip Because links on the open web die quickly
Before installing, ensure the following to prevent corruption or mismatches: forza horizon 4 100 save game steam link
Regarding a Steam link, Forza Horizon 4 is available on Steam, and you can purchase and download it directly through the platform. If you're looking to add it to your library: